Emission Area Electrode Layout for Brighter, Dark-Spot-Free Displays
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Solution Overview
Problem
Display devices face challenges in improving luminance and preventing dark spots in emission areas, as existing technologies struggle to effectively manage the alignment and electrical signaling of light emitting elements.
Innovation Solution
A display device design featuring a bank on a substrate with distinct emission areas, where alignment electrodes provide alternating AC and ground signals, and light emitting elements are strategically positioned to avoid overlap with a dividing line, ensuring efficient alignment and emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If alignment electrodes are disposed in emission areas to improve luminance, then light emission efficiency is improved, but dark spots may occur due to improper alignment or electrical signaling
Solution Approach 1:
The emission area is divided into multiple distinct emission areas (first emission area, second emission area, etc.) with dividing lines between them. Alignment electrodes are separately disposed in each emission area, allowing independent optimization and control of alignment signals for each region, thereby improving luminance while preventing dark spots through localized adjustment
Solution Approach 2:
Different alignment electrodes are configured with different electrical signals (alternating AC signals and ground signals) tailored to specific emission areas. This local differentiation allows each emission area to receive optimized alignment signals according to its specific requirements, improving overall luminance while preventing dark spots through localized signal optimization
2Measurement precision
If multiple alignment electrodes are disposed in each emission area to improve alignment precision, then light emitting element alignment is improved, but device complexity increases
Solution Approach 1:
The alignment electrode configuration uses an asymmetric pattern where odd-numbered alignment electrodes receive AC signals and even-numbered alignment electrodes receive ground signals. This asymmetric signal distribution creates an effective alignment field while maintaining a relatively simple overall structure, avoiding the need for complex symmetric configurations
Solution Approach 2:
Alternating AC signals and ground signals are applied periodically to adjacent alignment electrodes, creating a periodic electric field pattern that effectively aligns light emitting elements. This periodic signal application achieves precise alignment through a simple repeating pattern rather than complex variable signals
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances luminance and prevents dark spots by ensuring precise alignment and efficient light emission, improving overall display performance.
Implementation Method 1
first alignment electrodes, at least a number of the first alignment electrodes being disposed in the first emission area; second alignment electrodes, at least a number of the second alignment electrodes being disposed in the second emission area... each of the first alignment electrodes may alternately provide an AC signal and a ground signal in the case that the light emitting element is aligned
Data Source
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AI summary
A display device (DD) includes a bank (BNK) disposed on a substrate (SUB), the bank surrounding at least a portion of each of a first emission area (EMA1) and a second emission area (EMA2) in a plan view; first alignment electrodes (ELT1-1 .. ELT1-4), at least a number of the first alignment electrodes (ELT2-1 .. ELT2-4) being disposed in the first emission area (EMA1); second alignment electrodes (ELT2-1 .. ELT2-4), at least a number of the second alignment electrodes being disposed in the second emission area (EMA2); and a light emitting element (LD) disposed in each of the first emission area and the second emission area. An electrode (ELT1-4) most adjacent to the second emission area (EMA2) among the first alignment electrodes and an electrode (ELT2-1) most adjacent to the first emission area (EMA1) among the second alignment electrodes are spaced apart from each other with a dividing line (1020) disposed therebetween, and the dividing line overlaps the bank (BNK) in a plan view.